21726245475 has 72 divisors (see below), whose sum is σ = 42506989200. Its totient is φ = 10520236800.

The previous prime is 21726245459. The next prime is 21726245479. The reversal of 21726245475 is 57454262712.

21726245475 is a `hidden beast` number, since 2 + 1 + 72 + 62 + 454 + 75 = 666.

It is not a de Polignac number, because 21726245475 - 2⁴ = 21726245459 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21726245475.

It is not an unprimeable number, because it can be changed into a prime (21726245479) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2046481 + ... + 2057069.

It is an arithmetic number, because the mean of its divisors is an integer number (590374850).

Almost surely, 2^21726245475 is an apocalyptic number.

21726245475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21726245475 is a deficient number, since it is larger than the sum of its proper divisors (20780743725).

21726245475 is a wasteful number, since it uses less digits than its factorization.

21726245475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11445 (or 11437 counting only the distinct ones).

The product of its digits is 940800, while the sum is 45.

The spelling of 21726245475 in words is "twenty-one billion, seven hundred twenty-six million, two hundred forty-five thousand, four hundred seventy-five".